Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a7bc73b7f7988570e0364010830ef644558e8b1afedeebdbb3af0be4d81185' 
  AND token = 'PRkWLtZaMU5vJnvuLx/gSy5nMeURfIh+oWwqd0KfS2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}